$FE18/65048: Control OS Messages
Jump from $FF90:
FE18: 85 9D STA $9D ; Error-Mode-Flag
Jump from $FE0B:
FE1A: A5 90 LDA $90 ; Kernal I/O Status Word ST
Jump from $EDB2, $EE4F, $F18A, $F518, $FA81, $FAC6, $FB35, $FB88:
FE1C: 05 90 ORA $90 ; Kernal I/O Status Word ST
FE1E: 85 90 STA $90 ; Kernal I/O Status Word ST
FE20: 60 RTS
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